There's a pub where I hang out, and it is possible to make a bet with a gentleman there outside of the local gaming laws. When this World Cup started, he started taking soccer bets, since people were interested. The local guys, used to betting on baseball, understood money lines. What completely bamboozled them was that in a soccer match there are three possible outcomes, all with a separate money line. They were under the impression that a tie counted as a push, and they would only lose the vig on a tie. Couple of guys lost a few hundred that way before they figured it out.

The good part is that you saw hard-bitten American sports fans actually cheering for soccer teams, cursing referees, and generally getting into the game a lot more when they had some money riding on it.